Thanks for the replies.I mean if i keep changing engine oil from PAO to Ester then Eter to PAO.
I tried different types of engine oil in my car.
Ex:Motul 8100 5w-40 PAO
0w-40 PAO/Ester
300v 5w-30 ESTER
Mobil1 5w-50 PAO
0w-40 PAO
Castrol 10w-30. Group2+Ester.
So far Mobil1 0w-40 was the best.
I am currently running Denso VK20 iridium spark plugs in my 2001 model 2.2L toyota camry.
Far better than PK20TR-11.
Also Volker is another good brand very cheap **8.50 per plug.160000km/2year warranty.
I still think Castrol Formula R 0w-40 is worth for money.If you buy direct from the distributor you only pay $45 per 5L jug.The only thing you have to buy minimum 3 jugs.Mobil1 10w-30 should be ok for the winter and not during the summer.What do you think about mobil1 0w-40?